Nanoparticles of nucleotide-free analogue of vitamin B formed in protein nanocarriers and their neuroprotective activity in vivo.

Recently, we have described the first supermolecular nanoentities of vitamin B derivative, viz. monocyano form of heptabutyl cobyrinate, unique nanoparticles with strong noncovalent intermolecular interactions, emerging optical and catalytic properties. Their nearest analogue, heptamethyl cobyrinate (ACCby), exhibits bioactivity.

Modulation of polyaniline memristive device switching voltage by nucleotide-free analogue of vitamin B.

Memristive devices offer essential properties to become a part of the next-generation computing systems based on neuromorphic principles. Organic memristive devices exhibit a unique set of properties which makes them an indispensable choice for specific applications, such as interfacing with biological systems. While the switching rate of organic devices can be easily adjusted over a wide range through various methods, controlling the switching potential is often more challenging, as this parameter is intricately tied to the materials used.

High Reactivity of Supermolecular Nanoentities of a Vitamin B Derivative in Langmuir-Schaefer Films Toward Gaseous Toxins.

Recently, we have described the first supermolecular nanoentities (SMEs) of a vitamin B derivative, viz., a monocyano form of heptabutyl cobyrinate ((CN)Cby), unique nanoparticles with strong noncovalent intermolecular interactions, and emerging optical and redox properties. In this work, the fast response of thin films based on the SMEs of the B derivative to gaseous toxins (viz.

Supermolecular Nanoentities of Vitamin B Derivative as a Link in the Evolution of the Parent Molecules During Self-Assembly at the Air-Water Interface.

Nanoarchitectures with promising properties have now been formed from many important biomolecules. However, the preparation of nanoparticles of vitamin B and its derivatives remains an ongoing research challenge. This paper describes the formation of supermolecular nanoentities (SMEs) of vitamin B derivatives, unique nanoparticles with strong noncovalent intermolecular interactions, emerging properties, and activity.

[Comparative studies of neurotrophic drugs based on brain hydrolysates].

The results of the analysis of comparative studies of neurotrophic drugs based on brain hydrolysates (BH) are presented. The most comprehensive comparative study of the BH drugs carried out by Zhang, et al. 2019 investigated the effects of four drugs (cognistar, cerebrolysate, cortexin, cerebrolysin) on a model of ischemic stroke in rats.

Encapsulation of vitamin B into nanoengineered capsules and soft matter nanosystems for targeted delivery.

Targeted delivery of vitamins to a desirable area is an active branch in a modern pharmacology. The most important and difficult delivery of vitamin B is that to bone marrow and nerve cells. Herein we present a first step towards the development of two types of smart carriers, polymer capsules and lyotropic liquid-crystalline nanosystems, for vitamin B targeted delivery and induced release.

Magnesium Porphine Supermolecules and Two-Dimensional Nanoaggregates Formed Using the Langmuir-Schaefer Technique.

Porphyrins are functional elements of important biomolecules, whose assemblies play a central role in fundamental processes such as electron transfer, oxygen transport, enzymatic catalysis, and light harvesting. Here we report an approach to formation of porphyrin supermolecules, a particular type of nanoparticles with unusually strong noncovalent intermolecular interactions. Key differences between the supermolecules and noncovalent nanostructures described earlier are as follows.

[Mismatch negativity and its hemodynamic equivalent (based on fMRI) in research of speech perception in healthy and in speech disorders].

The review is devoted to the use of electrophysiological index of auditory discrimination, known as "mismatch negativity" (MMN), and its hemodynamic equivalent obtained by functional magnetic resonamce imaging (fMRI) to study speech perception in normal and pathological conditions. Most attention is paid to works with using MMN as a neurophysiological index of the phonemic hearing impairment in patients with sensory aphasia. The MMN applicability for examination of speech compensation degree is substantiated.

[Brain mapping in verbal and spatial thinking].

The goal of this study was to describe the topography of the active cortical areas and subcortical structuresin verbal and spatial thinking. The method of functional magnetic resonance imaging (fMRI) was used. 18 right-handed subjects participated in the study.

[FMRI-study of speech perception impairment in post-stroke patients with sensory aphasia].

The aim of the study was to find neurophysiological correlates of the primary stage impairment of speech perception, namely phonemic discrimination, in patients with sensory aphasia after acute ischemic stroke in the left hemisphere by noninvasive method of fMRI. For this purpose we registered the fMRI-equivalent of mismatch negativity (MMN) in response to the speech phonemes--syllables "ba" and "pa" in odd-ball paradigm in 20 healthy subjects and 23 patients with post-stroke sensory aphasia. In healthy subjects active brain areas depending from the MMN contrast were observed in the superior temporal and inferior frontal gyri in the right and left hemispheres.

[Antitumor activity of cold-adapted strains of influenza virus in a model transformed murine tumor cells].

Influenza virus suppressed tumor growth after injection to tumor zone in a dose of 7-8 lg EID50, as was shown for two continuous mouse tumor cell strains, Ehrlich's carcinoma and L-1210 lymphoma. Influenza virus strains differed by their antitumor activity which correlated with their interferonogenic activity. Antitumor activity of influenza virus depended on the site of application, dose of the virus, and interferonogenic activity.

[Experimental coronavirus encephalomyelitis in mice].

A combined comparative virological, morphological, and immunological study of experimental coronavirus encephalomyelitis was carried out in mice in order to elucidate the pathogenetic mechanisms involved in the formation of the foci of lesions in acute and chronic forms of the disease. Intracerebral inoculation of C3H mice with the neurotropic JHM strain of murine hepatitis virus induces a disease with demyelinization foci in the CNS running acute, subacute, or chronic course. This model underlies a concept that demyelinating diseases are caused by viruses producing immunopathologic responses realized via certain histocompatibility loci.

[Effect of regulator cells induced by the influenza virus in adoptive transfer].

The protective effect of humoral and cellular immunity factors on experimental mouse influenza infection was studied in combination with a simultaneous analysis of the functional activity in the regulatory lymphocytes of donor mice. The efficacy of adoptive defense of recipient mice, that is the intensity of immune reactions in their organisms, was found to depend on the concrete functional state of donor mouse transferring cells. The exact time of activation of T-helper cells open certain prospects for the concrete pathogenetically grounded drug therapy.

[Protective effectiveness of the blood sera and immune system cells from mice immunized with live or inactivated influenza virus].

The results of the study of comparative protective role of humoral and cell-mediated immunity factors obtained from inbred donor mice immunized with live or inactivated influenza virus are presented. The superiority of the live virus over the inactivated preparation as the inducer of not only humoral but especially cell-mediated immune response was demonstrated by the effectiveness of passive intranasal protection of the infected mice, by the degree of inhibition of virus reproduction in the lungs of the protected mice, and by the capacity for interferon production by the cells of the immune system of donor mice.

Comparison of the anti-influenza activities of antibodies and immune system cells administered intranasally to syngeneic mice.

A novel experimental approach was employed to investigate the protective role of cellular and humoral factors in antiviral immunity under conditions of their prophylactic administration into the tracheobronchial cavities of normal mice-recipients which were challenged 24 hr later with influenza virus A/PR/8/34 (H0N1). The highest protective effect was afforded by intranasal administration of immune serum (91.3%) as compared with splenocytes (65.

[Effectiveness of humoral and cellular protective factors in experimental influenza].

The results of application of a new experimental approach proposed by A. A. Smorodintsev in investigations of a comparative defensive role of cellular and humoral factors of influenza immunity in the phenomena of recovery are presented.